28 Nelson and Goldinan — New Mammals from Lower California. 



Myotis capitaneus sp. nov. 



8AN JORGE BAT. 



Type from San Jorge, :!U miles soutliwest of Comondn, Lower California, 

 :\Iexic() (altitude 100 feet). No. 14(),046, U. S. National Musemn, Bio- 

 logical Survey Collection, d^ adult. Collected November 12, 1905, by 

 E. W. Nelson and E. A. Goldman. Original num])er 18,526. 



General characters. — Externally much like M. californicus, but sliglitly 

 larger with ears shorter, more rounded ; tragus shorter, more abruptly 

 tapering, witliout distinct notch alxive lobe at posterior base ; foot larger; 

 skull more like 31. nigricaiis, l)ut rostrum still shorter, and bniincase 

 much larger, more inflated. 



Color. — Fur of upperparts rich 1)rownish cinnamon, becoming paler on 

 head; underparts pale ochraceous huffy, tinged with lirowuish; nmzzle 

 dusky. 



Skull. — Somewhat like tliat of J/, irigricanx, l)ut shorter and l)roader; 

 rostrum decidedly shorter; braincase much larger, more inflated ante- 

 riorly, archiug more a])ruptly from rostrum; interorbital region broader; 

 ni>iier molars i)roportionati'ly shorter and broader; crown of third upper 

 premolar decidedly broader than long. 



MeasuremenU. — Total length, 92; tail vertelme, 42; forearm (<lryskin), 

 83.(5; tibia (dry skin), 18.9; foot (dry skin), 7.4; thumb (dry skin), 5.8; 

 heiglitofear (dry skin), 9.1. Skull: condylobasal length, 12.2; Itreadth 

 of braiucase, (j.9; de{)th of l)raincase, 5.1 ; maxillary toothrow, 4.5. 



Myotis micronyx sp. nov. 



COMONDr LONG-EARED BAT. 



Ti/pr from Comondu, Lower California, Mexico (altitude 700 feet). No. 

 14(),044, U. S. National Museum, Biological Survey Collection, o* adult. 

 Collected November 8, 19(15, by E. W. Nelson and P:. A. (Goldman. ( )rigi- 

 nal number 18,490. 



General characters. — Much like .1/. crotis, but slightly smaller, with 

 proportiouately much smaller ears, thumb and claws; braincase more 

 iullated anteriorly; free borders of interfemoral UKMubrane indistinctly 

 ciliate as in erotis. 



Color. — Fur of upperparts, including middle of face, light golden cinna- 

 mon ; sides of face thinly covered with dusky hairs; underj)arts gray, 

 slightly tinged with buff. 



Skull. — Similar to ecotis, but narrower; braincase higher, moreinilated 

 anteriorly, arching more abruptly from rostrum ; i)alate narrower behind 

 molars; bulhe smaller. From that of milleri the skull diliV'rs in tlu' same 

 characters as from erotis. 



Miasureinents. — Total k^ngth, 90; tail vertebni', 42 ; forearm (dry skin), 

 35.8; til)ia (dry skin), 18.2; foot (dry skin), 7.9; tliumii (dry skin), 5.7; 

 height of ear (dry skin), 14.(). Skull: condylobasal length, 14.5; zygo- 

 matic breadth, 14.15; breadth of braincase, 7.2; depth of braincase, 5.3; 

 maxillary toothrow, G.2. 



